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Timestamp Converter - Unix Epoch to Date & Vice Versa

Free online Unix timestamp converter. Instantly convert epoch timestamps (seconds & milliseconds) to readable dates in UTC and local time, and vice versa.

Updated

What is the Timestamp Converter - Unix Epoch to Date & Vice Versa?

Convert Unix timestamps (epoch time) to human-readable dates and back instantly and accurately.

What It Does

This free, client-side tool converts between:

  • Unix timestamp → Date
  • Date → Unix timestamp

It supports both:

  • Seconds (10-digit timestamps)
  • Milliseconds (13-digit timestamps) with smart auto-detection

Output Formats

The converter displays results in multiple formats:

  • UTC time
  • Local timezone
  • ISO 8601 format
  • Relative time (e.g., “2 hours ago”)

Who It’s For

This tool is especially useful for:

  • Developers working with APIs and backend systems
  • Data analysts processing time-series data
  • System administrators reviewing logs
  • Anyone debugging timestamps in databases or applications

Key Benefits

  • Instant bidirectional conversion
  • Automatic detection of timestamp format
  • Clean, multi-format time output
  • Fully client-side processing for privacy and speed
  • No data is sent to any server

How it works

1. Choose Direction

Select one of the two tabs:

  • Timestamp → Date
  • Date → Timestamp

2. Enter Your Input

Depending on the selected mode:

  • For timestamps:

  • Enter a numeric Unix timestamp

  • Supports both:

    • Seconds (10-digit)
    • Milliseconds (13-digit)

  • Or use the “Use current time” shortcut

  • For dates:

  • Use the native datetime picker

  • Or manually enter an ISO 8601 string

3. View Rich Results

The converter instantly displays multiple formats:

  • Unix timestamp (with unit detection)
  • UTC formatted time
  • Local time (formatted and ISO)
  • Relative time (e.g., “5 hours ago”, “in 3 days”)
  • One-click copy buttons for each output format

Privacy & Processing

All conversions run entirely in your browser.
No data is sent, stored, or transmitted to any server.

Examples

Convert Unix Timestamp to Date

Decode a common 10-digit Unix timestamp from logs or APIs.

1722470400
2024-08-01 00:00:00 (UTC)
Relative: 1 year ago (approx.)

Convert JavaScript Millisecond Timestamp

Handle 13-digit timestamps commonly returned by JS Date.now().

1722470400000
2024-08-01 00:00:00 (UTC)
Relative: 1 year ago (approx.)

Generate Timestamp from Date

Create a timestamp for a future or past event (e.g., scheduling).

2025-12-25 10:30
1766653800 (seconds)

Frequently asked questions

What is a Unix timestamp (epoch time)?

A Unix timestamp (also called epoch time) represents the number of seconds or milliseconds that have elapsed since January 1, 1970, 00:00:00 UTC (the Unix epoch). Key characteristics:

  • Fully timezone-independent (based on UTC).
  • Widely used in programming, databases, and APIs.
  • Provides a compact way to store date and time values.
  • Easy to compare, sort, and compute time differences.

What is the difference between seconds and milliseconds?

Unix timestamps can be represented in different levels of precision depending on the system.

  • Seconds (10-digit timestamps):
  • Common in PHP, MySQL, Linux, and many backend systems.
  • Milliseconds (13-digit timestamps):
  • Common in JavaScript, Java, and modern APIs. This tool can:
  • Automatically detect the timestamp format.
  • Allow manual selection between seconds and milliseconds.
  • Convert between both formats instantly.

Are timestamps affected by timezones?

No. Unix timestamps always represent a fixed point in time.

  • Stored relative to UTC.
  • The numeric value does not change based on location.
  • Only the displayed human-readable date varies depending on timezone.
  • Ideal for distributed systems and global applications.

Does this tool work offline?

Yes. All timestamp conversions happen directly in your browser.

  • No data is sent to any server.
  • No internet connection is required after loading the page.
  • Conversions are instant and private.
  • Your data remains entirely on your device.

What about dates before 1970?

Yes, dates before the Unix epoch are fully supported.

  • Dates before January 1, 1970 are represented using negative timestamps.
  • These negative values correctly map to historical dates and times.
  • Useful for working with archival, historical, or legacy datasets.
  • Accuracy depends on the supported range of JavaScript Date objects.

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